Nut-lock.



J, G. GROWSON.

NUT LOOK. 7

APPLICATION FILED 10110.28, 1908.

Patented May 18, 1909.

2 SHEETS-SHEET 1.

f3 awwul'oz Guam/L witnmw inc-i J. G. GROWSON.

NUT'LOOK. APPLICATION FILED D110. 28, 1908.

2 SHEETSSHEET 2.

Patented May 18, 1909.

GOlflfiflib 921,805. TIE- &

atliomig JOHN C. OROWSON, OF PENSACOLA, FLORIDA.

NUT-LOOK.

Specification of Letters Patent.

Patented May 18, 1909.

Application filed December 28, 1908. Serial No. 469,523.

To all whom it may concern:

Be it known that I, JOHN G. CROWSON, a citizen of the United States,residing at Pensacola, in the county of Escambia, State of Florida, haveinvented certain new and useful Improvements in Nut-Locks; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

This invention relates to nut locks, and has for one of its objects toprovide a sim ply constructed device of this character whereby a nut isprevented from becoming loose upon the bolt or turning backward thereon.

With this and other objects in view the invention consists in certainnovel features of construction as hereafter shown and described and thenspecifically pointed out in the claims.

The improved device may be applied to bolts of various kinds and tobolts employed for various purposes, but is more particularly applicableto bolts for securing two bodies together with the bolt in a horizontalposition, but it will be understood that the invention is notnecessarily limited to bolts arranged horizontally, and it is notdesired therefore to limit the invention to bolts arranged in thismanner. For the purpose of illustration however, a bolt is shownarranged horizontally and operating to clamp two bodies together, and inthe drawings thus employed, Figure 1 is a side elevation of the bolt andits improved nuts with the body which is clamped by the bolt in section.Fig. 2 is an end view of the bolt and its nuts. Fig. 3 is a section onthe line 33 of Fig. 1. Fig. 4: is a perspective view of the main nutfrom the outsid Fig. 5 is a perspective view of the main nut from theinside. Fig. 6 is a perspective view of the j am nut from the inside.Fig. 7 is a perspective view of a modified form of the main nut from theoutside. Fig. 8 is a perspectiveview of a modified form of the main nutfrom the inside. Fig. 9 is a sectional detail illustrating amodification in the construction.

The bolt comprises a body portion 10 having a head 11 of any suitableform, and when employed in clamping wooden bodies will be provided withholding fins or protuberances 12 to prevent the rotation of the bolt.Two bodies are represented at 13-14: through which the bolt extends.

The bolt 10 is formed with a threaded portion 15,,a reduced portion 16at the outer terminal of the threaded portion 15 and with a reducedthreaded portion 17 in advance of the reduced portion 16, the reducedportion 16 being preferably square or in other form than round, theobject to be hereafter eX- plained.

Engaging the threaded portion 15 is a main nut 18, the latter providedwith a cavity or recess 19 in its outer face, the depth of the cavitybeing suificient to cause one or more of the threads of the threadedportion 15 of the bolt to extend into the cavity or recess when the nutis turned home against the bodies 1 113, as shown in Fig. 3. The reducedportion 16 is thus wholly within the recess 19, while the reducedthreaded portion 17 extends beyond the outer face of the nut 18 inposition to receive a jam nut 20. The jam nut is formed with a pluralityof radially arranged grooves 21 in its inner face. Any number of thegrooves may be employed, but for the purpose of illustration four of thegrooves are shown. The material of the nut is cut away as shown at 22between two of the grooves to provide communication between the same,the object to be hereafter explained. The main nut 18 may be of anyexternal form, but for the purpose of illustration is shown square, andthe jam nut is shown with eight sides to reduce the weight. Formed uponthe inner face of the nut is an annular rib 23, designed to bite intothe body 14L, and thus increase the holding power of the nut. The rib 23may be a continuous circle as shown in Fig. 5, or in the form ofratchets as shown in Fig. 8 at 24:.

In applying the improved device the bolt 10 is located through thebodies l3-14 and the nut 18 applied and turned home in the ordinarymanner by a wrench or other implement, this operation causing the rib 23to enter the body 14, when the latter is of relatively soft material,such as wood, and to bear with greater force upon the body when thelatter is of metal. The rib thus serves to distribute the strains moreuniformly and cause the nut to clench harder upon the body. When appliedto a wood body the rib being. spaced from the bolt, would cause the boltto be maintained more steadily in position. thenarranged upon thereduced threaded portion 17 and rotated to'bring one of the grooves 21into position, to receive the looking element. All of the outer openends of the grooves except one are then closed by inserting therein asmall quantity of putty, clay, or like material, and then inserting intothe open grooves a quantity of material such as melted lead, or likemetal or compound, which passes into. the cavity 19 and surrounds theportion of the bolt which passes through the cavity, the materiallikewise passing into the portions of the grooves 21 not occupied by theputty or clay and likewise through the recess 22. As before stated thecavity 19 is of sufficient depth to cause one or more of the threads 15to be disposed within the cavity, and when the securing material is thuspassed into the cavity it passes around these exposed threads andlikewise around the reduced portion 16 and likewise around the exposedthreads of the portion 17. The recess 19 will be formed either square asshown in Fig. 4, or polygonal as shown in Fig. 7, so that the materialforms an effectual lock between the nuts and the bolt.

1Vhile melted lead is noted as a suitable material to be employed as alocking means between the bolt and nut, any other material compound orsubstance which will accomplish the same results may be used. F orinstance shredded lead may be employed as a locking medium instead ofmelted lead, as will be obvious.

Vith a device thus constructed it will be obvious that the nuts arefirmly and eifeo tually secured upon the bolt and prevented from rotarymovement in either direction. The nuts. will thus be effectuallyprevented from becoming loosened no matter how severely the bodies 1314and the bolt may be subjected to jars and concussions.

When employed in connection with some structures the jam nut 20 may notbe re quired, and in that event the ductile material will be inserted inthe recess 19 only, and engage with the exposed threads 15 and thereduced portion 16. The ductile ele ment will thus effectually lock thenut in position upon the bolt, but the nut thus secured will not offeras firm a resistance to retrograde movement as when the jam nut isemployed.

The improved device is simple in construction, can be inexpensivelymanufactured, and applied to bolts and nuts of various sizes andemployed for various purposes, as before stated.

What is claimed, is

The jam nut 20 is irregularly surfaced portion, a nut engaging said mainthreaded portion with a recess in its outer face in advance of thethreaded aperture thereof with a part of the main threaded portion ofthe bolt and the irregular portion extending into the recess,

a jam nut engaging the outer threaded portion, and a locking deviceconsisting of a metallic element fusible at a lower tempcrature than thematerial of the nut and the bolt and inserted while fused into therecess and around the portion of the bolt within the same.

In a nut look, a bolt having a threaded port-ion near one end and with aprojection having irregular outer surfaces in advance of the threadedportion and a reduced threaded portion in advance of the irregularlysurfaced portion, a nut engaging said threaded portion with a recess inits outer face surrounding the inner aperture thereof with a part of'thethreaded portion of the bolt and the irregular portion extending intothe recess, a jam nut engaging the reduced threaded portion and providedwith radial grooves in its inner face, and a locking device consistingof a metallic element fusible at a lower temperature than the materialof the nut and bolt and inserted while fused into the recess and thegrooves of the jam nut and around the portion of the bolt within therecess.

In a nut lock, a bolt having a threaded portion near one end and with aprojection having irregular outersurfaces in advance of the threadedportion and a reduced threaded portion in advance of the irregularlysurfaced portion, a nut engaging said threaded portion with a recess inits outer face surrounding the inner aperture thereof with a part of thethreaded portion of the bolt and the irregular portion extending intothe recess, a jam nut engaging the reduced threaded portion and providedwith radial grooves in its inner face, and a locking d vice consistingof a ductile element compressible into the recess and the grooves of thejam nut and around the portion of the bolt within the recess.

In testimony whereof, I aflix my signature, in presence of twowitnesses.

JOHN C. GROWVSON.

itnesses W. G. DEVLEN, J. T. MAoKEY.

